Custom delegate iOS 6 using ARC not working - objective-c

Question

I am a begginer with Objective-C programming.
I searched here and in other websites to a way to solve my problem but i did not find.
I want to create an login view before the system load. Then, after login i want to dismiss it.
On my project i use ARC and not use Storyboards.
When i debug and look into the function "efetuarLogin" the value of property delegate is 0x000000. I think it is blank, is not?
According to the tutorials and other tips i found on the internet, this is the right way to code delegate. Can you check this for me?
Here is the code:
Login.h
#import <UIKit/UIKit.h>
#class Login;
#protocol LoginDelegate <NSObject>
#required
- (void)loginDidFinish: (Login *)login;
#end
#interface Login : UIViewController{
__weak id<LoginDelegate> delegate;
}
#property (nonatomic, weak) id <LoginDelegate> delegate;
- (IBAction)efetuarLogin:(id)sender;
#end
Login.M
#import "Login.h"
#implementation Login
#synthesize delegate;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)efetuarLogin:(id)sender {
[delegate loginDidFinish:self];
}
#end
MainController.h
#import <UIKit/UIKit.h>
#import "Login.h"
#interface MainController : UITabBarController <LoginDelegate>
#end
MainController.m
#import "MainController.h"
#import "Login.h"
#import "ModalViews.h"
#import "Alerts.h"
#import "ViewPadrao.h"
#import "TableView.h"
#implementation MainController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
ModalViews *modalViews = [[ModalViews alloc] initWithNibName:#"ModalViews" bundle:nil];
Alerts *alerts = [[Alerts alloc] initWithNibName:#"Alerts" bundle:nil];
ViewPadrao *viewPadrao = [[ViewPadrao alloc] initWithNibName:#"ViewPadrao" bundle:nil];
TableView *tableView = [[TableView alloc] initWithNibName:#"TableView" bundle:nil];
self.viewControllers = #[modalViews, alerts, viewPadrao, tableView];
}
- (void)viewDidAppear:(BOOL)animated{
[super viewDidAppear:animated];
Login *login = [[Login alloc] initWithNibName:#"Login" bundle:nil];
[login setModalTransitionStyle:UIModalTransitionStyleCoverVertical];
[self presentViewController:login animated:NO completion:nil];
}
- (void)loginDidFinish: (Login *)login{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Sua mensagem aqui" message:#"Mensagem" delegate:self cancelButtonTitle:#"Fechar" otherButtonTitles:nil];
[alert show];
[self dismissViewControllerAnimated:YES completion:nil];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
And the method didFinishLaunchingOptions of AppDelegate.m:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
mainController = [[MainController alloc] init];
window.rootViewController = mainController;
[window makeKeyAndVisible];
return YES;
}
Sorry for the high quantity of code. I am thankful since already!!
I am using the ViewDidAppear method to show Login to users. But when i dismiss and the MainController appears, the method viewdidapper creates the Login again.
How i do to show login once? When i tried to do this on viewdidload it did not work. The login did not appear.

Answer 1

In your MainViewController.m when you create login object
- (void)viewDidAppear:(BOOL)animated{
[super viewDidAppear:animated];
Login *login = [[Login alloc] initWithNibName:#"Login" bundle:nil];
login.delegate = self; //add this line
[login setModalTransitionStyle:UIModalTransitionStyleCoverVertical];
[self presentViewController:login animated:NO completion:nil];
}
EDIT : After seeing OP's edit in the question (which should have been a different thread)
Your view Controller hierarchy is wrong. The ideal flow should be
1) Show Login controller directly from App delegate.
2) After successfull login, show MainViewController from Login Controller.